Here is the full list of all 25 Royal Heroes achievements.
Craft a weapon that only the worthy can wield
Collect the whole set
Come to dark side. We have cookies. And extra spell slot.
Discover all air spells
Sacrifice a weak one to make your army stronger
Clear a whole other dimension. Get Warping Power increase.
Discover all void spells
Veni Vidi Vici!
Find and restore a famous weapon. Get Warping Power increase.
Find and 'pet' at least 10 sheep
Warp a few times
Find and kill all of famous vampires
Flawless victory - no casualties
Hire a 4 star hero
Do something useful. DOIT!
You can't be a winner all the time
Dont be a Batman - do it!
Discover all water spells
Discover all earth spells
Discover all fire spells